ObjectiveResource和损坏的NSNumberFormatter

self.item.price可能是NSString?

通过一次可怕的破解,我可以准确地重现你的结果:

NSNumber *price = (NSNumber*)@"13.5"; // *shiver*, don't try this at home!
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];

[formatter setNumberStyle:NSNumberFormatterCurrencyStyle];

NSLog(@"Price: %@", [formatter stringFromNumber:price]);
NSLog(@"Price: %@", [formatter stringFromNumber:[NSNumber numberWithDouble:[price doubleValue]]]);

NSString 响应 doubleValue

2010-07-16 17:17:50.384 test[716:207] Price: (null)
2010-07-16 17:17:50.386 test[716:207] Price: $13.50

为了解决这个问题,在XML元素委托(xmlementdelegate.m)中,需要取消注释一段代码以支持NSNumber。这条线是:

// uncomment this if you what to support NSNumber and NSDecimalNumber
// if you do your classId must be a NSNumber since rails will pass it as such
else if ([type isEqualToString:@"decimal"]) {
    return [NSDecimalNumber decimalNumberWithString:propertyValue];
}
else if ([type isEqualToString:@"integer"]) {
    return [NSNumber numberWithInt:[propertyValue intValue]];
}